Although it might not feel like spring yet, snow geese are already making plans to migrate north in preparation for warmer weather.

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More than 400,000 of them are making a pit stop at the DeSoto National Wildlife Refuge of Harrison County, Iowa. People are flocking from all over, too, to catch a glimpse of the spectacular migration.

Find out how the wildlife's visitor center is being taken over by record-setting numbers of snow geese and human visitors, by watching the video above.